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| Mirrors > Home > MPE Home > Th. List > funcnv0 | Structured version Visualization version GIF version | ||
| Description: The converse of the empty set is a function. (Contributed by AV, 7-Jan-2021.) |
| Ref | Expression |
|---|---|
| funcnv0 | ⊢ Fun ◡∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fun0 6546 | . 2 ⊢ Fun ∅ | |
| 2 | cnv0 6087 | . . 3 ⊢ ◡∅ = ∅ | |
| 3 | 2 | funeqi 6502 | . 2 ⊢ (Fun ◡∅ ↔ Fun ∅) |
| 4 | 1, 3 | mpbir 231 | 1 ⊢ Fun ◡∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∅c0 4283 ◡ccnv 5615 Fun wfun 6475 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-12 2180 ax-ext 2703 ax-sep 5234 ax-nul 5244 ax-pr 5370 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-mo 2535 df-clab 2710 df-cleq 2723 df-clel 2806 df-ral 3048 df-rex 3057 df-rab 3396 df-v 3438 df-dif 3905 df-un 3907 df-ss 3919 df-nul 4284 df-if 4476 df-sn 4577 df-pr 4579 df-op 4583 df-br 5092 df-opab 5154 df-id 5511 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-fun 6483 |
| This theorem is referenced by: f10 6796 pthdlem1 29742 0trl 30097 0pth 30100 |
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